A signed guitar pickguard, autographed in-person by Peter Cetera (vocals/bass) of Chicago. In-Person Signature. Authentication: JSA (James Spence Authentication) Certification Number: EE53321 Collector Note: Signed guitar pickguards featuring Peter Cetera are highly desirable, representing the legendary bassist and vocalist of Chicago, one of the most successful and influential rock bands in history. Authenticated in-person signed guitar memorabilia are especially sought after by collectors of classic rock and music memorabilia. A display-ready, standout collectible from a true rock and pop icon.